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Convertible Preferred Stock and Stockholders' Deficit - Summary of Common Stock Issued and Reserved for Issuance (Details) - shares | Sep. 30, 2018 | Jul. 31, 2018 | Dec. 31, 2017
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Stockholders Deficit [Line Items] |  |  |
Shares of common stock issued | 17,579,000 |  | 231,000
Shares of common stock reserved for issuance for: |  |  |
Total shares of common stock issued and reserved for issuance | 22,162,000 |  | 14,040,000
Series A-1 Convertible Preferred Stock |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 166,000
Series A-2 Convertible Preferred Stock |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 898,000
Series B Convertible Preferred Stock |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 697,000
Series C Convertible Preferred Stock |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 1,063,000
Series D Convertible Preferred Stock |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 1,705,000
Series E Convertible Preferred Stock |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 1,534,000
Series F Convertible Preferred Stock |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 3,531,000
Series G Convertible Preferred Stock |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 1,400,000
Series E Convertible Preferred Stock Warrants |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 14,000
Series F Convertible Preferred Stock Warrants |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 91,000
Common Stock Warrants Outstanding |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance | 105,000 |  |
Warrants Issuable Upon Term C Loan Borrowing |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance |  |  | 20,000
Shares Available for Sales Under Employee Stock Purchase Plan |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance | 244,000 | 200,000 |
Stock Options Outstanding |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance | 2,873,000 |  | 2,444,000
Shares Available for Grant Under Stock Incentive Plan |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance | 1,323,000 |  | 246,000
Restricted Stock Units Outstanding |  |  |
Shares of common stock reserved for issuance for: |  |  |
Shares of common stock reserved for issuance | 38,000 |  |

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